EP0794327B1 - Kühlungssystem für Verbrennungsmotoren - Google Patents
Kühlungssystem für Verbrennungsmotoren Download PDFInfo
- Publication number
- EP0794327B1 EP0794327B1 EP97300566A EP97300566A EP0794327B1 EP 0794327 B1 EP0794327 B1 EP 0794327B1 EP 97300566 A EP97300566 A EP 97300566A EP 97300566 A EP97300566 A EP 97300566A EP 0794327 B1 EP0794327 B1 EP 0794327B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bypass
- flow
- thermostat
- engine
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
- G05D23/1306—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids
- G05D23/132—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element
- G05D23/1333—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures for liquids with temperature sensing element measuring the temperature of incoming fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2037/00—Controlling
- F01P2037/02—Controlling starting
Definitions
- This invention relates to the cooling systems of motor vehicles of the kind in which a heater system for the vehicle utilises heat generated by the engine of the vehicle to provide an energy source for the heater.
- a heater circuit normally takes hot coolant from the engine cooling system as it exits the engine, passes it through a suitable heat exchanger and returns it to the engine cooling circuit at a position upstream from an engine-driven pump used to circulate the coolant through the engine cooling circuit.
- the heater circuit bypasses the engine cooling radiator, a combined bypass and flow-controlling thermostat being used to control the flow through the engine cooling radiator and through a bypass circuit which is arranged to bypass the engine cooling radiator.
- the pump output performance is related to the speed at which the engine is operating and there is a considerable difference in the flow rate and pressure provided by the pump when the engine is idling compared to when it is running at high speed.
- JP-A-61-201-816 It is known from JP-A-61-201-816 to provide an engine cooling system for providing an improved heating effect and increasing the speed of cabin heating by providing a check valve in a bypass circuit of a cooling device provided with a thermo-sensitive valve for closing a radiator circuit when the temperature of cooling water is below a given magnitude and opening and closing the check valve by the suction pressure of a water pump, said engine cooling system being of the kind defined in the preamble of claim 1.
- the invention provides a cooling system as defined in claim 1.
- the temperature-responsive flow controlling means and the temperature-responsive biasing means include a thermostat and the temperature-responsive flow controlling means also includes a return flow valve, the thermostat being operative to open the return flow valve in response to increasing temperature in the bypass flow arid arranged such that the spring-loading on the bypass valve member increases as the return flow valve becomes opened by the thermostat.
- the thermostat may include a thermostat body, a main spring being arranged to act against opening of the return flow valve by movement of the thermostat body, the temperature-responsive biasing means also comprising a secondary spring arranged to act between the bypass valve member and the thermostat body, whereby movement of the thermostat body with increasing temperature both opens the return flow valve against the action of the main spring and increases the spring loading of the secondary spring on the bypass valve member.
- the bypass valve and the temperature-responsive flow controlling means may be provided in a combined thermostat and bypass valve assembly, the assembly comprising a housing having a return flow port, a housing outlet and the bypass delivery port, the thermostat body being arranged to operate the return flow valve at the return flow port against the action of the main spring and the bypass valve member being biased towards the bypass delivery port by the secondary spring.
- the invention provides a combined thermostat and bypass valve assembly in an engine cooling system as set out in the preceding paragraph and including the bypass valve and the temperature-responsive flow controlling means as set forth in this paragraph.
- the secondary spring acts between the bypass valve member and the thermostat body, it acts in support of the main spring and the main spring can consequently be of lighter construction than would otherwise be necessary.
- a vehicle engine cooling system illustrated by Figure 1, comprises an air-cooled radiator R through which a flow of hot coolant is passed through a top hose TH from an engine E.
- An engine-driven pump P is located in a return line RL to circulate the coolant around the cooling system.
- a combined thermostat and bypass valve assembly 10 is positioned between a bottom hose BH leading from the radiator R and the return line RL to control the flow of coolant through the radiator R and a bypass circuit B.
- a heater system comprising a fluid to air heat exchanger H and a fan F is associated with a heater circuit of the cooling system and takes a supply of hot coolant from the top hose TH of the cooling circuit, passes it through the heat exchanger H and returns it to the return line RL of the cooling circuit downstream from the combined bypass and thermostat assembly 10.
- the heater circuit bypasses the radiator R, the bypass circuit B and the thermostat assembly 10 to define a distinct but interconnected flow circuit.
- the heat exchanger H is of the multiple pass type so as to extract the maximum amount of heat from the hot media passing therethrough for transfer to the air to be heated.
- a construction inevitably results in a flow path of substantially greater resistance than that through either the radiator R or the bypass circuit B. Therefore whenever the thermostat 10 is operable to allow flow. through either the radiator R or the bypass circuit B the majority of coolant will pass through these circuits to the detriment of the flow through the heat exchanger H. Although this is not a problem when the engine is operating at normal running speeds at lower running speed the flow through the heat exchanger H is so reduced that the performance of the heater system is affected.
- the combined bypass and thermostat assembly is designed as described below to prevent the flow of coolant through the bypass circuit B when the pressure in the bypass circuit B is below a pre-determined level.
- the combined thermostat and bypass assembly comprises a housing 12 defining a chamber, a first fluid flow inlet in the form of a return flow entry tube 14 for connection to -the bottom hose BH from the radiator, a second fluid flow inlet in the form of a bypass flow entry tube 16 for connection to the bypass circuit B, and a fluid outlet in the form of an outlet tube 18 for connection to the return line RL.
- a thermostat is mounted within the chamber to control the flow of coolant entering via the return and bypass tubes 14 and 16.
- the thermostat has a forward bridging frame 20 which is secured at its periphery to the housing 12 and forms an annular seat 22 defining a return flow entry port.
- a first valve member 24 is secured to a temperature-responsive valve actuating means in the form of a reaction body 26 for abutment against the seat 22 to thereby selectively close the first fluid inlet.
- a main coil spring 28 is located upon the reaction body 26 and extends between a rearward frame 30 secured to the forward frame 20 and the valve member 24.
- the main spring 28 acts to bias the valve member 24 into engagement with the annular seat 22.
- the reaction body 26 has a drive pin 32 extending therefrom for engagement with the forward frame 20 and a stud 34 projecting rearwardly towards the bypass entry tube 16.
- the housing forms a seat 36.
- a bypass valve member 38 is slideably mounted on the stud 34 and is biased towards the seating 36 by a secondary coil spring 40.
- the length of the stud 34 is sufficient to allow the second valve member 38 to contact the seat 36 even when the first valve is in contact with the annular seat 22.
- the secondary spring 40 acts between the valve member 38 and a rear end surface 35 of the reaction body 26 and is retained upon the stud 34 by a retaining head 42 at a free end of the stud 34.
- the secondary spring 40 has a relatively low spring rate of approximately 0.5kg per mm and is biased against the seating 36 when the main valve 24 is closed to provide approximately a 1.5kg pre-load.
- the exact spring rate chosen for the secondary spring 40 and the pre-load depend upon the surface area of the valve member 38 and the characteristics of the pump 'P'.
- bypass valve member 38 is able to abut against the bypass seating 36 even when the main valve member 24 is closed.
- the assembly as shown in Figure 2 is in a start-up condition, with the main valve 24 closed to prevent the flow of coolant through the radiator 'R'.
- the bypass valve member 38 is held lightly against the bypass seating 36 by the secondary spring 40 to restrict bypass flow through the bypass circuit 'B'. However, a small amount of flow is allowed to enter the chamber through a bleed passage 19 so as to ensure that the temperature-sensitive reaction body 26 is maintained in coolant corresponding in temperature to that exiting the engine 'E'.
- the restriction of the flow through the bypass circuit 'B' encourages flow through the heat exchanger 'H' of the heater circuit thereby improving the performance of the heater.
- bypass valve member 38 By selecting an appropriate spring rate and pre-load for the secondary spring 40 the bypass valve member 38 can be arranged to be held in engagement with the seat 36 up to an engine speed of approximately 1500 R.P.M. and then be fully open at an engine speed of 2000 R.P.M.
- the thermostat and bypass valve assembly by means of the first valve 24 and the bypass valve 38, distributes the flow of coolant between the bypass circuit 'B' and the radiator 'R' depending upon the temperature of the coolant in the chamber.
- bypass valve 38 and the secondary coil spring 40 function as a control means maintaining so far as possible a high flow of coolant through the heater circuit to ensure that a sufficient supply of hot coolant is passed into the heater exchanger to warm the air for the passenger compartment.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Temperature-Responsive Valves (AREA)
Claims (3)
- Kühlsystem für einen Verbrennungsmotor (E) eines Fahrzeugs, wobei das Kühlsystem folgendes umfaßt: ein Kühlmittel (R), durch das eine Teilmenge einer heißen Kühlmittelausgangsströmung vom Motor geleitet werden kann, bevor sie als eine gekühlte Rücklaufströmung an den Motor zurückgeleitet wird, einen Bypass (B), der es ermöglicht, eine andere Teilmenge der Ausgangsströmung, ohne sie durch das Kühlmittel zu führen, als eine Bypassströmung an den Motor zurückzuleiten, ein auf Temperatur reagierendes Strömungsregelungsmittel (10), das dazu dient, die Teilmengen der Ausgangsströmung zwischen der gekühlten Rücklaufströmung und der Bypassströmung aufzuteilen, und das einen Thermostaten (26) und ein Rücklaufventil (24) beinhaltet, wobei der Thermostat (26) dazu dient, das Rücklaufventil in Reaktion auf ansteigende Temperatur in der Bypassströmung zu öffnen, einen Heizkreislauf, der es ermöglicht, eine weitere Teilmenge der Ausgangsströmung durch eine Luftströmungsheizung (H) zu leiten und als eine Heizungsströmung zum Motor zurückzuführen, um dadurch einen Bypass um das Kühlmittel und um den Bypass zu schaffen, eine motorangetriebene Pumpe (P), um Kühlmittel im Kühlsystem umzuwälzen, und ein Bypassventil, das ein Bypassventilelement (38) umfaßt, das gegen Druck im Bypass (B) mittels Federbelastung in Sitzeingriff mit einer Bypasszuführungsöffnung (36) gebracht wird, um die Bypassströmung zu beschränken und dadurch die Heizungsströmung zu verstärken, dadurch gekennzeichnet, daß der Thermostat (26) dafür ausgelegt ist, die auf das Bypassventilelement (38) einwirkende Federbelastung zu erhöhen, wenn die Temperatur der Bypassströmung zunimmt, wobei das Bypassventilelement (38) durch die Federbelastung in Sitzeingriff mit der Bypasszuführungsöffnung (36) in einem Startzustand gehalten wird, wenn das Rücklaufventil (24) geschlossen ist, um die Kühlmittelströmung durch das Kühlmittel (R) zu verhindern.
- Kühlsystem nach Anspruch 1, bei dem der Thermostat einen Thermostatkörper (26) und eine Hauptfeder (28) beinhaltet, die so angeordnet ist, daß sie dem Öffnen des Rücklaufventils (24) durch Bewegung des Thermostatkörpers entgegenwirkt, wobei das auf Temperatur reagierende Vorspannmittel auch eine Sekundärfeder (40) umfaßt, die dafür ausgeführt ist, zwischen dem Bypassventilelement (38) und dem Thermostatkörper so zu wirken, daß durch Bewegung'des Thermostatkörpers (26) mit zunehmender Temperatur sowohl das Rücklaufventil (24) gegen die Wirkung der Hauptfeder (28) geöffnet als auch die auf das Bypassventilelement (38) einwirkende Federbelastung der Sekundärfeder (40) erhöht wird.
- Kühlsystem nach Anspruch 2, bei dem das Bypassventil (38) und das auf Temperatur reagierende Strömungsregelungsmittel (24) in einer kombinierten Thermostat- und Bypassventileinheit (10) vorgesehen sind, wobei die Einheit ein Gehäuse (12) mit einer Rücklauföffnung (22), einem Gehäuseauslaß (18) und der Bypasszuführungsöffnung (36) umfaßt, wobei der Thermostatkörper (26) dafür ausgeführt ist, das Rücklaufventil (24) an der Rücklauföffnung (22) gegen die Wirkung der Hauptfeder (28) zu betätigen, und wobei das Bypassventilelement (38) durch die Sekundärfeder (40) zur Bypasszuführungsöffnung (36) hin vorgespannt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9604780 | 1996-03-06 | ||
GB9604780A GB2310923B (en) | 1996-03-06 | 1996-03-06 | Vehicle engine cooling system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0794327A1 EP0794327A1 (de) | 1997-09-10 |
EP0794327B1 true EP0794327B1 (de) | 2003-10-08 |
Family
ID=10789960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97300566A Expired - Lifetime EP0794327B1 (de) | 1996-03-06 | 1997-01-29 | Kühlungssystem für Verbrennungsmotoren |
Country Status (4)
Country | Link |
---|---|
US (1) | US5787845A (de) |
EP (1) | EP0794327B1 (de) |
DE (1) | DE69725363T2 (de) |
GB (1) | GB2310923B (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1134642B1 (de) * | 2000-03-09 | 2003-12-10 | Behr Thermot-tronik Italia S.p.A. | Thermostatventil zur Regelung des Kühlmitteldurchflusses in einer Brennkraftmaschine |
GB0310122D0 (en) | 2003-05-02 | 2003-06-04 | Ford Global Tech Llc | Temperature responsive flow control valves for engine cooling systems |
GB0310120D0 (en) | 2003-05-02 | 2003-06-04 | Ford Global Tech Llc | Engine cooling systems |
US20080115747A1 (en) * | 2006-10-31 | 2008-05-22 | International Engine Intellectual Property Company, Llc | Coolant controller for an internal combustion engine |
JP4921955B2 (ja) * | 2006-12-26 | 2012-04-25 | 富士精工株式会社 | サーモスタット装置 |
CN101860178B (zh) * | 2010-05-21 | 2012-05-30 | 上海海立特种制冷设备有限公司 | 一种风力发电机组冷却系统温控阀块的改良结构 |
DE102017200876A1 (de) * | 2016-11-14 | 2018-05-17 | Mahle International Gmbh | Elektrische Kühlmittelpumpe |
DE102018214315B4 (de) | 2018-08-24 | 2022-08-11 | Vitesco Technologies GmbH | Ladegerät zum Einbau in ein elektrisch antreibbares Fahrzeug, Fahrzeug und Verfahren zum Kühlen von Komponenten eines elektrisch antreibbaren Fahrzeugs |
TR201919504A2 (tr) * | 2019-12-07 | 2021-06-21 | Kirpart Otomotiv Parcalari Sanayi Ve Ticaret A S | Isitici portuna doğru olan akiş mi̇ktarini düzenli̇ olarak ayarlayan bi̇r termostat terti̇bati |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1791756A (en) * | 1926-03-20 | 1931-02-10 | Bishop & Babcock Mfg Co | Control means for cooling systems for internal-combustion engines |
US4055298A (en) * | 1976-01-19 | 1977-10-25 | Standard-Thomson Corporation | Thermally responsive by-pass valve device providing maximum flow area |
DE2755464A1 (de) * | 1977-12-13 | 1979-06-21 | Daimler Benz Ag | Thermostatisches regelventil |
DE3112202C2 (de) * | 1981-03-27 | 1984-11-15 | Bayerische Motoren Werke Ag, 8000 Muenchen | Kühlvorrichtung für flüssigkeitsgekühlte Brennkraftmaschinen |
DE3433319A1 (de) * | 1984-09-11 | 1986-03-20 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg | Einkreiskuehlung fuer ladeluftgekuehlte schiffsmotoren |
CA1264431A (en) * | 1985-02-19 | 1990-01-16 | Yoshikazu Kuze | Cooling system for an automobile engine |
JPS61201816A (ja) * | 1985-03-04 | 1986-09-06 | Daihatsu Motor Co Ltd | エンジンの冷却装置 |
DE9102294U1 (de) * | 1991-02-27 | 1992-06-25 | Behr-Thomson Dehnstoffregler GmbH & Co, 7014 Kornwestheim | Thermostatventil |
DE4330215A1 (de) * | 1993-09-07 | 1995-03-09 | Behr Thomson Dehnstoffregler | Kühlanlage für einen Verbrennungsmotor eines Kraftfahrzeuges mit einem Ventil |
US5642691A (en) * | 1996-01-30 | 1997-07-01 | Brunswick Corporation | Thermostat assembly for a marine engine with bypass |
-
1996
- 1996-03-06 GB GB9604780A patent/GB2310923B/en not_active Revoked
-
1997
- 1997-01-29 EP EP97300566A patent/EP0794327B1/de not_active Expired - Lifetime
- 1997-01-29 DE DE69725363T patent/DE69725363T2/de not_active Expired - Lifetime
- 1997-02-10 US US08/897,209 patent/US5787845A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB2310923B (en) | 2000-05-24 |
DE69725363D1 (de) | 2003-11-13 |
EP0794327A1 (de) | 1997-09-10 |
GB9604780D0 (en) | 1996-05-08 |
GB2310923A (en) | 1997-09-10 |
US5787845A (en) | 1998-08-04 |
DE69725363T2 (de) | 2004-07-22 |
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